int value under 10 convert to string two digit number

Question

string strI      for  int i   1  i  lt  100  i        strI   i ToString      in here   if i   1 then ToString yields  1   But I want to get   01  or  001   It looks quite easy  but there s only article about   datetime ToString  yyyy-MM-dd

User · Answer

This blog post is a great little cheat-sheet to keep handy when trying to format strings to a variety of formats.

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Edit

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User · Answer

I can t believe nobody suggested this   int i   9  i ToString  D2       Will give you the string  09    or  i ToString  D8       Will give you the string  00000009    If you want hexadecimal   byte b   255  b ToString  X2       Will give you the string  FF    You can even use just  C  to display as currency if you locale currency symbol  See here  https   docs microsoft com en-us dotnet api system int32 tostring view netframework-4 7 2 System Int32 ToString System String

User · Answer

You can also do it this way  private static string GetPaddingSequence int padding          StringBuilder SB   new StringBuilder          for  int i   0  i  lt  padding  i                       SB Append  0                   return SB ToString         public static string FormatNumber int number  int padding        return number ToString GetPaddingSequence padding        Finally call the function FormatNumber  string x   FormatNumber 1 2     Output will be 01 which is based on your padding parameter  Increasing it will increase the number of 0s

User · Answer

The accepted answer is good and fast   i ToString  00     or   i ToString  000     If you need more complexity  String Format is worth a try   var str1       var str2       for  int i   1  i  lt  100  i          str1   String Format   0 00    i       str2   String Format   0 000    i       For the i   10 case      str1   10    str2   010    I use this  for example  to clear the text on particular Label Controls on my form by name   private void EmptyLabelArray         var fmt    Label Row 0 00  Col 0 00        for  var rowIndex   0  rowIndex  lt  100  rowIndex                  for  var colIndex   0  colIndex  lt  100  colIndex                          var lblName   String Format fmt  rowIndex  colIndex               foreach  var ctrl in this Controls                                var lbl   ctrl as Label                  if   lbl    null   amp  amp   lbl Name    lblName                                         lbl Text   null

User · Answer

I will start my answer saying that most of previous answers were perfectly good answers at the time of writing them   So  thank you to them who wrote them  Now  you can also use String Interpolation for same solution  Edit  Adding this explanation after receiving a perfectively valid constructive comment from Heretic Monkey   I have preferred to use  ToString whenever I had need to convert an integer to string and not add the result to any other string   And  I have preferred to use interpolation whenever I had need to combine string s  and an integer  like in below examples  String Interpolation i ToString  quot 00 quot   01  i ToString  quot 000 quot   001  i ToString  quot 0000 quot   0001    quot Prefix  i 00  quot  Prefix 01    quot Prefix  i 000  quot  Prefix 001    quot Prefix  i 0000  Suffix quot  Prefix 0001 Suffix

User · Answer

ToString can take a format   try   i ToString  000

User · Answer

i ToString  00     or   i ToString  000     depending on what you want  Look at the MSDN article on custom numeric format strings for more options  http   msdn microsoft com en-us library 0c899ak8 VS 71  aspx

[c#] int value under 10 convert to string two digit number

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